Windshield cleaner



July 3, 1928.

F. G. FOLBERTH ET AL wINDsHInLD CLEANER Filed oct. 17,' 1924 3 Sheets-Sheet l Snowdon! @Horneg July 3, 192s.`

WINDSHIELD CLEANER 3 Sheets-Sheet 3 Filed Oct. 17, 1924 atto: 14mg Patented July 3, 1928.`

" UNITED STATES PATENT oFFicE.

FRISDIIRICIK G. FOLBERTH AND WILLIAM M. FOLBERTH, OF.CLEVELA ND, OHIO, AS- SIGNORS TO TRIGO PRODUCTS CORPORATION, OF BUFFALO, YORK, A. CORPORA- T1017 oF NEW Yonx.

WINDSHIELD CLEANER.

Application led October 17, 1924. `Serial No. 744,269.

This invention relates to windshield cleaners, and more particularly to improvements in suction motors .employed in connection with windshield cleaners of the type described and claimed in the patent to William M. Folberth, granted February 7, 1922, No. 1,405,773.

An object of the invention is the provision of an improved valve shifting mechanism for a windshield cleaner motor, wherein a floating lever is employed by means 'of which greater leverage is obtained.

In the construction of Windshield cleaner motors, the valve mechanism heretofore employed'consists of a pivoted lever arranged in the path of a moving part of the motor and a `pivoted valve supporting member connected thereto. The levers are connected to each other at points remote from their piv` ots by means of a spring which is adapted to store up energy during the initial movement of the first lever Vand to positively move the second lever to shift the valve when theA piston or movable element approaches the end of its stroke.

In the present invention, we employ a third lever, designated as a floating lever and arranged between thelirst lever and the spring. This lever is so arranged that duringI the initial movementothe firstlever, o r valve actuating member, the leverage exerted on the spring is increased and the energy stored in the spring without affecting the movementof the piston. At an appropriate time, the movement of the rfloating lever is arrested and the spr-ing functions in its ordinary manner.

A further object of the invention is the provision of means for retaining the clean-Y ing arm in a raised position at. the end of a stroke when the cleaner motor is cut o i.

In the accompanying drawings, We have shown several embodimentsof the invention. /In this showing: i

Figure 1 is a perpective view of the motor `and cleaner arm assembled, v v

Figure 2 is a central vertical sectional view of the cleaner in position on a Windshield,

Figure 3 is a vertical sectional view on line 3 3 of Figure 2, Figure 4 is a similar view on line 4 4 of Figure 2,

` Figure 5is al horizontal sectional. view substantially on line 5-5 of Figure l,

Figure 6 is a view of a part of the motor in the same plane as Figure 4, showing the valve and the valve shifting mechanism in its other alternate position,

Figure 7 is a detail view of the valve and valve shifting mechanism disassembled,

Figure 8 is a perspective View of a closure plate on which the' valve mechanism is assembled, l

Figure 9 is a View similar to- Figure 2 showing another form of valve shifting mechanism,

Figure 10 is a view similar to Figure 3, showing another form of the means for retaining the cleaner arm in raised position, and,

Figure 11 is a detailed disassembled view of the valve and valve actuating mechanism shown in Figure 9 of the drawings.

Referring to Figures l to 8 of the drawingsl the reference numeral l designates a windshield of a motor vehicle formed of glass or other transparent material and mounted in a suitable frame 2. The Windshield cleaner consists of a motor 3 adapted to be arranged on the Windshield frame and secured thereto in any suitable manner. The motor is provided with a transverse shaft 4 which extends,A through the frame and a cleaner arm 5 is arranged adjacent the outer end thereof. This cleaner arm is provided with a holder 6 on its lower end adapted to receive a cleaner element consisting of a backing strip 7 of metal or other rigid material and a strip of rubber 8 which 1s adapted to contact with the surface of the windshield to be cleaned (see Figure 2). The motor shaft also extends from the inner side of the motor casing and is provided with a handle 9 to permit manual operation. p

More particularly the motor is formed'ot two substantially cup-like sections 1() which may be 'formed of drawn sheet .metal and which are provided with flared inner ends 11. As' shown, the outer ends of the sections are closed as at 12, forming the heads of the cylinder, and the inner endsI are adapted to be secured to each other to form a' cylinder. A closure or body plate 13 1s arranged adjacent the junction ofthe inner ends of the two sections of the cyhnder and this closure plate is curved in cross section (see Figures 1 and 8) and is adapted to extend partially around the cylinder. The

inner face offthe closure plate is provided vided with a V-shaped groove 16 in its i11- ner face, 'adapted to receive'the flared ends 11 of the cylinder section. The outer face of the closure` member is provided with a substantially T-shaped rib or boss 17 and the upper end of the clamp is enlarged, as`

at 18, and secured to the top ofthis rib by means of screws 19. The lower end of the band is-provided with openings adapted to receive lugs `20 projecting from the face of the closure plate.

A pair of pistons are mounted within the' cylinder and retained in spaced relation. As shown, each piston consists of a pair of disks 21'of metal or other rigid material.l These disks are slightly smaller in diameter than the internal diameter of the cylinder and a sheet of packing 22 is arranged bctween them. As shown, the4 sheet of packing is of larger diameter than the cylinder forming a skirt 23. The pistons are connected to eachother by a connecting member 24, which is preferably formed of sheet metal and is provided with ends 25 extending at an angle to the body'of the connecting member. YScrews 26 are arranged in openings in the disks 21 and the ends 25 of the connecting member. As shown, the connecting member is provided with spaced openings 27 and is adapted to serve as a rack in transferring the movement of the .pistons tonthe shaft. An arcuate shaped plate 28 is arranged on the shaft and this plate provided with teeth 29 forming a segmental gear adapted to mesh with the teeth 27 ot the rack. As shown, the portion of the plate'above the shaft is extended parallel to the shaft, as at 30 (see Figure 2) and is then provided with a downwardly extending `portion 31 having an. opening for the passage of the'shaft by means of which the gear is provided with a double bearing.

fin

The enlargement 14 on the inner face of the closure plate is provided with an inwardly extendingsleeve 32, forming a bearing for the shaft, and the shaftl extends through anopening 33 formed in this sleeve and passing through thel closure plate. rIlhe other end of the shaft is received in a bearing 34 formed in the ends of the cylinder sections and a collar or spacing member 35 1s arranged on the shaft between the extension 3l. of the segmental inder wall (see Figure 2).

connected from each other.

gear and the cyl-- plate is providedwith a main suction'pas-() sage 36 having a tube 37 arranged therein f and`the end of this tube is adapted to be connected to a source of suction, such as the intake manifold of an internal combustion engine (not shown). vbygmeans of a suitable conduit (not shown). As shown, the main suction passage extends transversely ofthe T-shaped rib on the exterior of the closure plate or longitudinally of the cylinder. The end of this passage communicates ywith an inclined passage 38 extending inwardly to' the inner face of the enlargement 14 (see Figures 2 and 8). Suitable means are. provided for manually controlling the passage of fluid through the passages 36v and 38. sa An inclined passage is formed in the T- shaped rib adjacent the point of communication between the passages 36 and 38 and this inclined passage is internally threaded `for the reception of a valve stem 39. The

inner end of the valve stem is provided with a valve member 40 adapted to engage a seat formed at the junction of the passages 36 and 38 to permit these passages to be dis-' The outerend ofthe valve stein is provided with a suitable handle 41 and al spring 42 is arranged on 1 vthe'- valve stem. A cylinder passage 43 is 5 arranged on each side of the suction passage 38 and these passages extend outwardly in 100 a substantially horizont-al plane, as shown in dotted lines in Figure 2 of the drawings.- The outerends Iof these passages are connected to longitudinally extending'passages in the T-shaped rib and suitable tubes or I conduits 44 which extend longitudinally of the cylinders and are connected to the opposite ends of the cylinders through openings 45 arranged adjacent each end. N

The valve actuating mechanism consists of an actuator in the form of a lever 46 which is substantially semi-circular in shape to fit around the sleeve 32 and ywhich ispivotally mounted on the sleeve. As shown,

the sleeve is provided with a rib\47 on its 115' upper side havin a groove or bea-ring 48 -formedl therein. he forward end of this groove is closed bya block 49. The valve actuating lever is provided with a loop 50 at its upper end and the end of this loop is arranged parallel to the body portion, as` at 51. These 4parallel portions are provided with depending members 52 having rounded lower ends adapted to vfit in the groove 48 to pivotally support the lever. Thev lower end of the lever yisprovided withja. depending arm 53 adapted to engage spaced pins 54 vcarried on` the face of the segmental gear.

A substantially.cup-shaped valvey 55 isar- 1,e75,sss

14 and is adapted to cover the central suction passage and either one ofthe cylinder passages `to establish communication between the source f suction and either end of the cylinder (see Figure 5). This valve is provided with a stem 56 adapted to be received in an opening 57 in one of the arms 58 of a substantially U-shaped valve supporting member or carrier, The base of the valve supporting member is provided with depending arms 59 adapted to engage a pin 60 carried on the face of the enlargement to limit the movement of the valve. The pin. 60 is preferably formed of rawhide or other non-metallic material to reduce the noise occasioned vby the shifting of the valves. The upper ends of the arms 58 are pointed, as at 61, and are adapted to be received in grooves or bearings 62 formed in enlarge.-

ments 63 on the bottom of the sleeve 32 to pivotally support the valve supporting member. The valve supporting memberl and the valve actuating vlever 46 are connected to each othei1 by means of a coil .spring and a yspring-positioning member in the nature of a floating lever.` As shown. the floating lever consists of asubstantially semi-cylindrical member 64 adapted to fit around the sleeve 32'provided with an opening 65 adjacent its upper end. The upper end of the valve actuating member and the arm 51 arranged parallel thereto are provided with alined notches 66 adapted to receive the reduced ends 67 of a roller 68. One end of this roller passes through the opening 65 in the floating lever and the body portion v4of the roller` retains the lever in the bdesired p vertical plane (see Figure; 2). 'The upper end of the floating lever is provided` with anr `shaped valve` supporting member.

Means are provided for retaining the cleaner arm in raised positionat the end of a stroke when the motor is cut oil. As shown,

a pin 73 extends from the ,arm 3l to the body portion of the segmental gear -and this pin passes through a substantially ellipticalshaped member 74. VThe pin is secured to the elliptical-shaped member on one of its Y `long sides and at a point directly opposite,

a coil spring 75 is connected thereto and the,

other end ot this spring -is connected to a projection 76 formed on -thefupper portion of Athe cylinder wall.

-ln the form ofy ,theinv'ention shown 4in Figures 9 to 11 of the drawings, the-construction and operation is essentially the same. The construction of the motor casing, closure plate, shaft and segmental gear are the same as that heretofore described, and the same reference numerals are employed to designate the various parts. In place of the valve actuating lever 46, 'we employ a lever 77 which is also` substantiallyseniicylindrical to lit around the sleeve 32 and which is providedwith a depending lower end 78 to engage the pins 54. The upper end of the valve actuating lever is provided with a loop 79 similar torthe loop 5() and is further provided with an extension 80 parallel to the body portion. Between the body portion of the lever and the extension 80, there is provided an arm 81 extendingy at right. angles to the body portion and having a depending end 82 arranged parallel to the body portion and the extension 80 and disposed between them (see Figure 9). In place of the roller 68, we employ a pin 83 adapted to pass through alined, openings in the body portion of the lever, the'depending end 82 and the extension 80.l The floating lever 64 is arranged between the parts 80 and 82, as shown in Figure X9 ot the draw-y ings, with the pin 83 passing` through the opening 65 and theseparts' serve to properly space the floating lever and retain kit in vthe desired plane.

In Figure 10 of the drawings, we shown another means `for retaining the vcleaner arm in raised position when the motor is cut ofi.- As shown, the extension 3l Kof the lsegmental gearkis provided with an opening adjacent its lower end, adapted to 'receive one end 84 of a spring. The spring consists of resilient Varms 84 and 85 con'- nelcted to each other by a. loop or coil 86. The arm 85 is secured to the top of the motorl casing, -as at 87.

In the operation of the 'formA of the invention shown in Figures l to 8`- ofI the drawings, the tube 37,isladapted to be convalve 55 is adapted to be shifted by the movement of the pistonsin the cylinder to alternately place the opposite 'ends-of the cylinder in communication with ithe. source of` suction. lVith the, parts-in thel posltiol shown inl Figure 5 ofthe drawings, the left end of thecylinder is in com n1un`cation with a source of suction and the pistons are moving to the left. .A t the end of a stroke, the valve is shifted to cover the ccntraLsuc-tionpassage` 38 and the right cylinder passage 43' to place the opposite end of the cylinder in communication source of suction.

In-Figures 4 to 6 of. the drawings, the valve' is in the same position as in Figure 5, connecting the vleft end of` the` cylinder to the source of suction. The position of the pistons and segmental gearin Figures 4 and 5 is atthe end of a stroke just after the with the have Y l l nccted to a suitable sourceof suction and thef valve has shifted. When the pistons begin the movement' toward the left `end of the cylinder, the segmentalgear 28 oscillates in a clockwise direction. The pin 54, which hasjust moved the valve actuating member 46 toits present position moves away from this member and the pin 54 to the right of the center of the segmental gear approaches.

the valve actuating member as the stroke is "l continued. Adjacent the end ofthe stroke,

the, pin 54 contacts with the lower end 53 o t the valve actuating lever. The valve actuating lever, being -pivoted in the groove l48 swings on its pivot. Asthe floating lever l5'v 64 is connected to the valve actuating lever by means of the roller 67, the upper end of "23' 48 to the rollel` 68 on the other side of the fulcruml This affords a great leverage dur-y mg the movement of the valve actuating member to a substantially central position during which time energy is vstored in the spring 72. l As th upper end of the floatingu lever is swung -to the right by the valve actuating lever, the lower end moves toward the right and upwardly, placing the spring under tension. At the time that the valve actu-ating lever passes the central position, as shown in Figure 6 of the drawings, the movement ofthe `floating lever is rarrested by the shoulder 70. AThe system of levers, forming a compound lever, connected at one -end of the spring 72, produces a novel and exceedingly prac-tical snap actin for an automaticl valve" mechanism. After the 'actu ating lever 46 begins its movement, its longer depending armirequires but a slight 45 force to move said lever on its fulcrum, the

shorter arm lever ,above the fulerum carry ing the .pin 67 with thelever 64 mounted thereon 1n a-bbodlly manner until the arm 69 of said lever 64 comes in contact with the obstructing shoulder 70.y At this point the lever movement `takes ra decided change.

The lever 64 is no longer bodily moved but assumes its character,as a lever, obtaining its fulcrum on the shoulder where'the 55 arm 69 is engaged. The actuating lever 46 then acts on the pin 67, which may be con sidered as being located at the outer end of the shorter arm of said lever 64, to swing the lower orl free yend of the longer arm of ""l said lever 64 to which the spring 72 is` connected. .Up to this' time the bodily mo've- -ment of the lever 64 has beerf relatively slow by reason of the fact that it is bodily supported for such movement on the shorter G5 armof the actuating llever 46. Consequently the end of the spring -72 which is engaged in seat 71 of said lever 64 will also be slowly moved toward a deadcentcr posi-`1 tion relativeto the pivotal mounting of the valve carrier 58. At the moment that'the lever 64 engages its fulcrum point, .or stop 70, the slow movement of the shorter arm Y ot lever 46 willrbe considerably multiplied at the lower or free end of the longer arm a of said lever 64. In other words the spring' carried end 7l ot' said lever 64 will have its spring shifting movement accelerated. decidedly as said spring 72is shiftedy across a dead center position. Obviously after the spring 72 has been shifted across a dead center position, the then tensionedrspring will pull the 'valve carrier'S to its other position.v rllhe pistons then will reverse their movement.

lt will therefore vbe noted that the energy required to place the spring '72 under tension is expended on the longer end of-said lever 46, and that the boost or acceleration required to carry the' spring across dead center ispractically momentary. Thus the valve action embodies a ,compoundvlever which permits a Y gradual storing up ot en- 4erfgy in the valve shifting spring, and then,

when the storing'up of the energy has been practically completed, the slow energy storingmovement of the spring is accelerated or given a boost 'sufficient to carry it across dead center. l,

It will also be noticed that the auxiliaryj spring device 74, 75, (84; 85, 86)A will also 100 be -expending its stored up energy in assisting the rotation ot the wiper shaft 4 at the moment when the valve spring 72 is given its boost `or acceleration. In this respect, the auxiliary'spring device '74,. 75 `(84, .85, 105 86) is having energy stored up therein during the first? portion or half of each shaft movemelrt,'and during the latter portion or half of each movement of the 'shaft said auxiliary spring device is expending its energ-y to not onlyurge the wiper element toward the end of its stro-ke,.but also of necessity assist in giving the valve spring movement an acceleration or boost.

The member 74 shown in Figure 3 of the, 115 drawings, swings with the shaft as it is oscillated and at the end of each stroke, the parts are in the position shown in Figure 3 or in a similar position on thc opposite side of the shaft. He1'etfore,'tl1-ere has been a 120 tendency for the cleaner arm to move downwardly from the position shown in Figure 1 ofthe drawings to the position shown in Figure 2 ofI the drawings, due to the weight of this member and its associated parts. ln order to move downwardly in the present construction, itis necessary to exert s utlicient force to place the spring 75 under' tension and by properly proportioning the strength of the spring movement of the 130 cleaner arm, prevented. It will also be noted thatthis member tends to assist in the equal distribution of energy throughout the stroke of the piston. During the rst part of the stroke. of the piston, no energy is being stored'i'n the spring 72 and the only force being expended by the cleaner is the force necessary to move the blade 8 over the surface of the windshield. Vhen the spring 75 is employed, it is also necessary for the motor to place this spring under tension during the iirst part of the stroke. During the latter part of the stroke when energy is f being stored, in the spring 72 of the valve actuating mechanism, the energy lstored in the spring 7 5' during the first part of the stroke is released, and the movementof the pistons is thus equalized.

In the form of the invention shown in Figures 9 to 11 of'the drawings, the operation of the valve actuating member is essentially `the same as that heretofore described. In this formof the invention, a pin 83 of substantially uniform diameter throughout is employed in place of the roller 68 and the extension '82 is employed for the purpose of maintaining the floating lever in the desired vertical plane. -The spring 84 also func-y tions n the same manner as the spring 75, exerting au upward pull when the cleaner blade is at the end of a stroke and tending to hold it in this position if the motor is v spring 72 and the -leverage ratio reduced after the energy has been stored and just before the movement of the spring and valve is a decided improvement in view of the fact thatthe amount of power available for the operation of a windshield cleaner motor is limited and lat times, when the engine of the .vehicle is laboring under a load and the throttle `valve is wide open, the vacuum in the manifold and the energy available for the operation-of the cleaner motor is reduced to practically zero. Under such conditions, the cleaner motor hasa tendencyto slow down and by increasing the leverage employed for storing energy in the spring 72, this tendency mayI be partially, if not wholly, overcome. The herein described subject matter relating to the Windshield cleaner construction has been ldivided from this application, the

'same forminga ypart of our co-pending application filed April 20, 1925, Serial No.

It is to be understood that the forms of Iour invention herewith shown and described are to be taken as preferred examples of the same, and that various changes in the shape,

motors comprising a valve, a carrier there- Y for; a spring connected at one end to said valve carrier and adapted to store up energy to effect a movement of the valve at the end o'f each stroke, and arsystem of levers connected .to the opposite end of the spring for being actuated by a movable part of the motor to actuatevsaid spring, and having a greater leverage during its initial movement when energy is being stored in said spring and a shorter, quicke'rfacting leverage during the later movement just before said sprin effects a movement of the valve.

2. alve 4actuating mechanism for windshield cleaners comprising a casing, a movable member mounted in lsaid casing, 'and a valve to alternately place said casing on opposite sides of said movable member in communication with a source of differential pressure, said valve actuating mechanism comprising a ymovable valve supporting member, a valve actuating member controlled by ysaid movable member, a member pivotally connected to one end ofsaid valve actuating member, and a spring connecting the opposite end of said pivotally connected member and said valve supporting member.

3. A device constructed in accordance with claim 2 wherein means are provided on the last-mentioned member to coact with a fixed part of the casing for limiting the movement ofv one end of said valve supportingv member.

4. Valve actuating mechanism for windshield cleaners comprising a casing, a movable member mounted in said casing, and a. valve to alternately place said casing. on opposite sides of said movable member 1n communication with a source of differentiall pressure, said valve actuating mechanism comprising a movable valve ,supporting member, a`movable valve actuating member controlled by said movable member, a member pivotally connected at one end to sald valve actuating member, and a spr1ng connecting the other end of 1said plvotally connected member and said valve -supportmg member. -v e. A

5. In a motor` forY Windshield cleaners., a valve, a pivoted carrier therefor, a sprlng connected'at one end.to the carrier, means connected to the opposite end of the sprlng -for moving it to lopposite sides ofdead center relative to the pivotal mounting of the carrier, means operable from a moving part of the motor for accelerating 'the movementv of the first means as said opposlte end of the spring approaches a dead center position and' continuing such Iacceleration as said first'means carries its connected end of the spring over dead center.

6. In a motor for windshield cleaners, a

, valve sliitable from one to another of two positions, resilient means movable to initially storeup energy and subsequently to 'expend the stored up energy in effecting 'a shift of the valve, means operable by a moving part of the motor' for so moving said resilient means, and means for effecting an acceleration in the movement of the second.A

inea-ns as the resilient means approaches its maximum limit of energy-storin rmovevnient for eiecting` a comparative y quick cliange-over to tliefenergy-expending movenientvof the resilient'means. i

7. In a niotor for windshield cleaners, a body plate having a valve seat and afshaft bearing, a valve cooperating with tlie seat. a

. carrier for shifting the valve on its seat, said carrier having pivotal support on'the bearing, an actuating lever operable from a moving part-of the motor and ulcrumed on the bearing at a point circuinferentially vspaced vfromthe carrier point of support,

and power-transmitting resilient means extending about tlie bearing to operatively connect the carrier andthe lever'and yieldingly hold the same pivotally supported on tli'e bearing against displacement. 8. In a motor for `windshield cleaners, a

body plate having al valvey seat, a valve on the latter, al carrier for the. valve having pivotal support on the plate, an actuating lever operable from a moving part of the motor and"having an oppositely disposed pivotal support on the. plate, alever pivoted on the actuating lever, a spring connected at one end to the carrierl and atfits oppositeend to the second lever, said second lever being` movable by the actuatinglL lever against a part of the motor as a fulcrum point about which. the saidsecond lever is moved by a continuation of the movement of the actuating lever 'for positioning the spring to im- Y art a sna m tion to the carrier said s lring riphery oppositely facing bearings, a valve engaged on the seat, a carrier for shifting the valve having pivotal support in one of Y the sleeve bearings, an actuatinglever operable from a moving part of thel motor and i j having pivotal support in the-oppositely facing sleeve bearing, a spring arranged on one si e of tlie sleeve and having one end connected to the carrier and its opposlte end l shiftable to oscillate the lcarrier about its i pivot, and a spring-positioning member vpivthe spring and then to permit .of the stored-up oted on theflever and connected t said opposite spring end for shifting the latter.

l10. In a motor for windshield cleaners,

a body plate, aival've, a carrier for moving the valve, a spring connected at one end to the carrier for moving thesame, a movable spring-positionin member connected to the opposite end of t e spring, an actuator for the member pivotally supporting the same and operable from a movin part of the motor, and means arranged in the path of the-member for varying its spring-positioning movement.

11. In a motor for windshield cleaners, a movable valve carrier, a `spring connected at vone end thereto, a spring-'positioning ineinber connected at one end to the opposite end of said spring, a movable actuator operable from a moving part ofthe motor and supporting the member, and means arran in the path of the member for accelerating the movement of the spring-connected end"` `the spring for moving the saine to op osite sides of a dead center relative to the pivotal mounting of the carrier, an actuator operable' from a moving part of the motor and Inov-v ing thefmember' to initially store up energy in the spring and then-to effect almovement -of the samev over dead center, and means to momentarily accelerate the ,movement of the member tocarry the sprin ,over dead center.

13'. Ina motor for win shield cleaners, a body plate having upwardly and downwardly facing open bearings, a. lever operable from a moving part of themotor and having a return bend, the latter. having a-depending fulcrum projection alinin with a similar projection on the body of t e lever,

said` projections seating in the upwardly facin open bearin forpivotally vsupporting t e lever, a va ve carrier pivotally engaged in the downwardly facingopen bear` ing, a spring connected tothe valve c arrier, and a spring-positioning member pivoted between the lever and its return bend and connected to the sprin whereby the ,latter will act to'yieldingly old both the carrier and the fulcrum projections in their respective bearings against displacement.

14. In a motor forwindshield cleaners, a

lbody #plate having spaced shoulders, a movable valve carrier, a spring connected to the carrier for shifting the same, amember movable initially for storing up energyr invv expenditure ener t0 shift the carrier ectey to the member and an actuator co operablefr'om a moving part of the niotor engage the shoulders by andduring movement of the actuator whereby the changeover from the energy-storing ,movementtol the energy-expendingmovement of the 'member will be accelerated.

15. In a motor for Windshield Kcleaners, a

vbody member having upper and lower bearings, a valve carrier freely pivotlng in one,

bearing, an actuating lever operable from a moving part of the motor and freely pivoting in the other bearing, a spring arranged on the carrier side .of the bearing and connected to the carrier, and a spring-positioning member supportedfby the lever outv wardly of its pivotal support and connected to the spring under tension whereby the spring will tend to hold the carrier and lever 1n their bearlngs.

`16. A snap action valve mechanism for fluid motors comprising a valve, a valve carrier, a spring connected at one end tothe carrier to operate the same, a lever having its longer arm connected to the opposite end of the spring, spaced stops between 'which the shorter arm of the lever is movable, and

l means operable by and during movement of lso a movable part of the motor for moving said leverto first engage said shorter arm .adjacent one or the other'of said stops and then continue the lever movement about the 'L engaged stop; as' a fulcruin\to effect a quick shift of saidopposite end of\the` spring for mov-ingthe valve.'V i

17. A `snap laction Ivalve mechanism for fluidv` motQ'rs comprising ak valve, ayalve carrier, a springconnect'ed at one end to the carrier to loperate the same, alever having its longer arm connected to the ,oppositeend of thespring, and an actuator-supportingithe lever for bodily movement .against a relatively fixed part of the mechanism, said fixed part ofthe mechanismv forming a fulcrum support `for said lever whereby on continuation of the movement of the actuactuator being operable from a moving part of the motor to which the mechanism is attached.,

`:18. A snap action valve mechanism for fluid motors comprising a valve, a valve cars vrier, a spring connected at one end to the of the' spring, an actuator pivotally supporting said lever adjacent the outer end of its shorter arm for bodilymovement of said lever, said actuator being o erable by and during movement of a mova le part of the motor to which the mechanism is attached, and a fulcrum support arranged in the path ,of bodily movement of said lever for being engaged thereby whereby on continuation of the movement of the actuator on the'shorter arm of said lever the longer arm will have its spring shifting movement accelerated.

19-In a motor for windshield cleaners,I a casing,'a piston therein, a shaft vrockable by the piston, a spring snap-action pvalve mechanism for operatively applying fluid pressure to the piston, said mechanism embodying a spring and a lever, said lever being operable from the piston for moving said spring to opposite sides of the pivot of said lever for actuating the valve of said mechanism, and auxiliary ymeans connecting the shaft to a part of theV motor and normally urging said shaft toward its adjacent ,limitI of" movement and thereby assisting' the lever in shifting said spring.

20. A snap-over valve mechanism for reciprocating fluid motors, comprising a valve and a valve carrier, a spring connected at `one end to said valve carrier and adapted to store up energy to effect a movement of the 'ilo valve at the end of eachlstroke of the motor,

a compound lever having vpivotally connected lever parts, one lever part being ac-y tuated b a movable part of the motor and having ulcrum support on a part of said position for actuating the Valve, the opposite end of said companion lever part obtaining `fulcrum engagement with affixed part of the motor.

In testimony whereof, we affixr our signatures. i y FREDERICK G. FoLBER'rH. WILLIAM M. FoLBERTH. 

